When multiple instances of a component that renders a createGlobalStyle-based component are mounted, unmounting any one of them removes the injected stylesheet entirely — even though other instances are still mounted and still depend on those styles.

Live reproduction: https://codesandbox.io/p/sandbox/sc-global-style-repro-forked-tw9tgn

Environnement:

• react: 18.3.1
• styled-components: 6.3.12